n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 15 |
4 | 73 |
5 | 425 |
6 | 2908 |
7 | 22855 |
8 | 202849 |
9 | 2005929 |
10 | 21864076 |
11 | 260374631 |
12 | 3363097609 |
13 | 46823803585 |
14 | 699001981588 |
15 | 11137295369775 |
16 | 188636060894593 |
17 | 3384325253935025 |
18 | 64113731067110644 |
19 | 1278893092183672159 |
20 | 26792685755013073801 |
21 | 588160948075800731961 |
22 | 13500922657476722741164 |
[1,1,4,15,73,425,2908,22855,202849,2005929, 21864076,260374631,3363097609,46823803585, 699001981588,11137295369775,188636060894593, 3384325253935025,64113731067110644, 1278893092183672159,26792685755013073801, 588160948075800731961,13500922657476722741164] |